Manpage of IO_CANCEL
IO_CANCELSection: Linux Programmer's Manual (2)
NAMEio_cancel - cancel an outstanding asynchronous I/O operation
#include <linux/aio_abi.h> /* Defines needed types */ int io_cancel(aio_context_t ctx_id, struct iocb *iocb, struct io_event *result);
The io_cancel() system call attempts to cancel an asynchronous I/O operation io_submit(2). The iocbargument describes the operation to be canceled and the ctx_idargument is the AIO context to which the operation was submitted. If the operation is successfully canceled, the event will be copied into the memory pointed to by resultwithout being placed into the completion queue.ly submitted with
RETURN VALUEOn success, io_cancel() returns 0. For the failure return, see NOTES.
- The iocb specified was not canceled.
- One of the data structures points to invalid data.
- The AIO context specified by ctx_id is invalid.
- io_cancel() is not implemented on this architecture.
NOTESGlibc does not provide a wrapper function for this system call. You could invoke it using syscall(2). But instead, you probably want to use the io_cancel() wrapper function provided by libaio.
Note that the libaiowrapper function uses a different type (io_context_t) for the ctx_idargument. Note also that the libaiowrapper does not follow the usual C library conventions for indicating errors: on error it returns a negated error number (the negative of one of the values listed in ERRORS). If the system call is invoked via syscall(2), then the return value follows the usual conventions for indicating an error: -1, with errnoset to a (positive) value that indicates the error.
SEE ALSOio_destroy(2), io_getevents(2), io_setup(2), io_submit(2), aio(7)
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